fit: Refactor config node handling
This patch makes some minor refactoring to the way the FIT parser
handles config nodes. A lot of this code was written in the dawn age of
depthcharge when its device tree library wasn't as well-stocked yet, so
some of it can be rewritten nicer with more high-level primitives.
There's no point in storing both the string name and the actual FDT node
of a FIT image node separately, since the latter also contains the
former, so remove that. Also eliminate code for the case of not having
an FDT (which makes no sense), and move some more FDT validity/compat
checking into fit_update_compat() (mostly in anticipation of later
changes).
This patch was adapted from depthcharge's http://crosreview.com/1553456
with a couple of modifications specific to coreboot's custom FIT loading
code.
Change-Id: Ia79e0fd0e1159c4aca64c453b82a0379b133350d
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32870
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/lib/fit.c b/src/lib/fit.c
index c98ba2f..5fbcd77 100644
--- a/src/lib/fit.c
+++ b/src/lib/fit.c
@@ -85,6 +85,17 @@
fit_add_compat_string(compat_string);
}
+static struct fit_image_node *find_image(const char *name)
+{
+ struct fit_image_node *image;
+ list_for_each(image, image_nodes, list_node) {
+ if (!strcmp(image->name, name))
+ return image;
+ }
+ printk(BIOS_ERR, "ERROR: Cannot find image node %s!\n", name);
+ return NULL;
+}
+
static void image_node(struct device_tree_node *node)
{
struct fit_image_node *image = xzalloc(sizeof(*image));
@@ -120,11 +131,11 @@
struct device_tree_property *prop;
list_for_each(prop, node->properties, list_node) {
if (!strcmp("kernel", prop->prop.name))
- config->kernel = prop->prop.data;
+ config->kernel = find_image(prop->prop.data);
else if (!strcmp("fdt", prop->prop.name))
- config->fdt = prop->prop.data;
+ config->fdt = find_image(prop->prop.data);
else if (!strcmp("ramdisk", prop->prop.name))
- config->ramdisk = prop->prop.data;
+ config->ramdisk = find_image(prop->prop.data);
}
list_insert_after(&config->list_node, &config_nodes);
@@ -132,40 +143,22 @@
static void fit_unpack(struct device_tree *tree, const char **default_config)
{
- assert(tree && tree->root);
+ struct device_tree_node *child;
+ struct device_tree_node *images = dt_find_node_by_path(tree, "/images",
+ NULL, NULL, 0);
+ if (images)
+ list_for_each(child, images->children, list_node)
+ image_node(child);
- struct device_tree_node *top;
- list_for_each(top, tree->root->children, list_node) {
- struct device_tree_node *child;
- if (!strcmp("images", top->name)) {
-
- list_for_each(child, top->children, list_node)
- image_node(child);
-
- } else if (!strcmp("configurations", top->name)) {
- struct device_tree_property *prop;
- list_for_each(prop, top->properties, list_node) {
- if (!strcmp("default", prop->prop.name) &&
- default_config)
- *default_config = prop->prop.data;
- }
-
- list_for_each(child, top->children, list_node)
- config_node(child);
- }
+ struct device_tree_node *configs = dt_find_node_by_path(tree,
+ "/configurations", NULL, NULL, 0);
+ if (configs) {
+ *default_config = dt_find_string_prop(configs, "default");
+ list_for_each(child, configs->children, list_node)
+ config_node(child);
}
}
-static struct fit_image_node *find_image(const char *name)
-{
- struct fit_image_node *image;
- list_for_each(image, image_nodes, list_node) {
- if (!strcmp(image->name, name))
- return image;
- }
- return NULL;
-}
-
static int fdt_find_compat(const void *blob, uint32_t start_offset,
struct fdt_property *prop)
{
@@ -393,18 +386,27 @@
/*
* Finds a compat string and updates the compat position and rank.
- * @param fdt_blob Pointer to FDT
* @param config The current config node to operate on
+ * @return 0 if compat updated, -1 if this FDT cannot be used.
*/
-static void fit_update_compat(const void *fdt_blob,
- struct fit_config_node *config)
+static int fit_update_compat(struct fit_config_node *config)
{
+ if (config->fdt->compression != CBFS_COMPRESS_NONE) {
+ printk(BIOS_ERR,
+ "FDT compression not yet supported, skipping %s.\n",
+ config->name);
+ return -1;
+ }
+
+ void *fdt_blob = config->fdt->data;
struct compat_string_entry *compat_node;
const struct fdt_header *fdt_header =
(const struct fdt_header *)fdt_blob;
uint32_t fdt_offset = be32_to_cpu(fdt_header->structure_offset);
size_t i = 0;
+ config->compat_pos = -1;
+ config->compat_rank = -1;
if (!fdt_find_compat(fdt_blob, fdt_offset, &config->compat)) {
list_for_each(compat_node, compat_strings, list_node) {
int pos = fit_check_compat(&config->compat,
@@ -419,6 +421,8 @@
i++;
}
}
+
+ return 0;
}
struct fit_config_node *fit_load(void *fit)
@@ -457,55 +461,41 @@
printk(BIOS_DEBUG, "\n");
/* Process and list the configs. */
list_for_each(config, config_nodes, list_node) {
- if (config->kernel)
- config->kernel_node = find_image(config->kernel);
- if (config->fdt)
- config->fdt_node = find_image(config->fdt);
- if (config->ramdisk)
- config->ramdisk_node = find_image(config->ramdisk);
+ if (!config->kernel) {
+ printk(BIOS_ERR,
+ "ERROR: config %s has no kernel, skipping.\n",
+ config->name);
+ continue;
+ }
+ if (!config->fdt) {
+ printk(BIOS_ERR,
+ "ERROR: config %s has no FDT, skipping.\n",
+ config->name);
+ continue;
+ }
- if (config->ramdisk_node &&
- config->ramdisk_node->compression < 0) {
+ if (config->ramdisk &&
+ config->ramdisk->compression < 0) {
printk(BIOS_WARNING, "WARN: Ramdisk is compressed with "
"an unsupported algorithm, discarding config %s."
"\n", config->name);
- list_remove(&config->list_node);
continue;
}
- if (!config->kernel_node ||
- (config->fdt && !config->fdt_node)) {
- printk(BIOS_DEBUG, "FIT: Missing image, discarding "
- "config %s.\n", config->name);
- list_remove(&config->list_node);
+ if (fit_update_compat(config))
continue;
- }
- if (config->fdt_node) {
- if (config->fdt_node->compression !=
- CBFS_COMPRESS_NONE) {
- printk(BIOS_DEBUG,
- "FIT: FDT compression not yet supported,"
- " skipping config %s.\n", config->name);
- list_remove(&config->list_node);
- continue;
- }
-
- config->compat_pos = -1;
- config->compat_rank = -1;
-
- fit_update_compat(config->fdt_node->data, config);
- }
printk(BIOS_DEBUG, "FIT: config %s", config->name);
if (default_config_name &&
!strcmp(config->name, default_config_name)) {
printk(BIOS_DEBUG, " (default)");
default_config = config;
}
- if (config->fdt)
- printk(BIOS_DEBUG, ", fdt %s", config->fdt);
+ printk(BIOS_DEBUG, ", kernel %s", config->kernel->name);
+ printk(BIOS_DEBUG, ", fdt %s", config->fdt->name);
if (config->ramdisk)
- printk(BIOS_DEBUG, ", ramdisk %s", config->ramdisk);
+ printk(BIOS_DEBUG, ", ramdisk %s",
+ config->ramdisk->name);
if (config->compat.name) {
printk(BIOS_DEBUG, ", compat");
int bytes = config->compat.size;
diff --git a/src/lib/fit_payload.c b/src/lib/fit_payload.c
index e0158f2..4bc6622 100644
--- a/src/lib/fit_payload.c
+++ b/src/lib/fit_payload.c
@@ -176,37 +176,34 @@
struct fit_config_node *config = fit_load(data);
- if (!config || !config->kernel_node) {
+ if (!config) {
printk(BIOS_ERR, "ERROR: Could not load FIT\n");
rdev_munmap(prog_rdev(payload), data);
return;
}
- if (config->fdt_node) {
- dt = fdt_unflatten(config->fdt_node->data);
- if (!dt) {
- printk(BIOS_ERR,
- "ERROR: Failed to unflatten the FDT.\n");
- rdev_munmap(prog_rdev(payload), data);
- return;
- }
-
- dt_apply_fixups(dt);
-
- /* Insert coreboot specific information */
- add_cb_fdt_data(dt);
-
- /* Update device_tree */
-#if defined(CONFIG_LINUX_COMMAND_LINE)
- fit_update_chosen(dt, (char *)CONFIG_LINUX_COMMAND_LINE);
-#endif
- fit_update_memory(dt);
+ dt = fdt_unflatten(config->fdt->data);
+ if (!dt) {
+ printk(BIOS_ERR, "ERROR: Failed to unflatten the FDT.\n");
+ rdev_munmap(prog_rdev(payload), data);
+ return;
}
+ dt_apply_fixups(dt);
+
+ /* Insert coreboot specific information */
+ add_cb_fdt_data(dt);
+
+ /* Update device_tree */
+#if defined(CONFIG_LINUX_COMMAND_LINE)
+ fit_update_chosen(dt, (char *)CONFIG_LINUX_COMMAND_LINE);
+#endif
+ fit_update_memory(dt);
+
/* Collect infos for fit_payload_arch */
- kernel.size = config->kernel_node->size;
+ kernel.size = config->kernel->size;
fdt.size = dt ? dt_flat_size(dt) : 0;
- initrd.size = config->ramdisk_node ? config->ramdisk_node->size : 0;
+ initrd.size = config->ramdisk ? config->ramdisk->size : 0;
/* Invoke arch specific payload placement and fixups */
if (!fit_payload_arch(payload, config, &kernel, &fdt, &initrd)) {
@@ -216,17 +213,15 @@
return;
}
- /* Load the images to given position */
- if (config->fdt_node) {
- /* Update device_tree */
- if (config->ramdisk_node)
- fit_add_ramdisk(dt, (void *)initrd.offset, initrd.size);
+ /* Update ramdisk location in FDT */
+ if (config->ramdisk)
+ fit_add_ramdisk(dt, (void *)initrd.offset, initrd.size);
- pack_fdt(&fdt, dt);
- }
+ /* Repack FDT for handoff to kernel */
+ pack_fdt(&fdt, dt);
- if (config->ramdisk_node &&
- extract(&initrd, config->ramdisk_node)) {
+ if (config->ramdisk &&
+ extract(&initrd, config->ramdisk)) {
printk(BIOS_ERR, "ERROR: Failed to extract initrd\n");
prog_set_entry(payload, NULL, NULL);
rdev_munmap(prog_rdev(payload), data);
@@ -235,7 +230,7 @@
timestamp_add_now(TS_KERNEL_DECOMPRESSION);
- if (extract(&kernel, config->kernel_node)) {
+ if (extract(&kernel, config->kernel)) {
printk(BIOS_ERR, "ERROR: Failed to extract kernel\n");
prog_set_entry(payload, NULL, NULL);
rdev_munmap(prog_rdev(payload), data);